TT #14 · Parshas Tazria · Aliyah 1 · Passuk 3
English: On the eighth day the flesh of his foreskin shall be circumcised.
Chabad.org — Chumash, English translation + Rashi for Vayikra 12:3
Torah Temimah cites Shabbos 132a.
E-Daf — Shabbos 132a · Shas.org — Shabbos 132a · Steinsaltz Center — Shabbos 132a
English: The verse says, “On the eighth day the flesh of his foreskin shall be circumcised”—even if the eighth day falls on Shabbos.
Textual inference
The wording “on the eighth day” establishes that circumcision on the eighth day overrides Shabbos.